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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0025c6cce7317b9428eb528e34b69ff05e83aeccad10b496fd5ca438440b5fbb' 
  AND token = 'amN1RywZcnfBzyS4hG5yWEiUhxIJmu3Pe4XPt2PmZ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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