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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d84f32d0a3e541c8afc2c8b8a34f446f16c120858bd5024129fbe089a950c9' 
  AND token = 'fbpDTBPpM+cEJVv2egerN+UlQoMmaBRNtqyqrWL1L8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00209

JSON explain

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