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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8604a5d3d6f1eaee8561dd5c06383a32bfd1bac567cbd915179d1948c61e62f' 
  AND token = 'YAay6XuK+9sxla8LLBRgInODm2+1MlyzCeWLXH96vAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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