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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5cd6e5ccb4b68bdfdd06138f5e5655fffb8a657c122578fae5d6b6b63c511d' 
  AND token = 'Fd70nzftWfVLQX7frv4kN61jH366kqp3oo7PDc/fJa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}