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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e762f9329a0d4a453b0bfebe09cee0fb34ec3209c00811159cb7bed727918de1' 
  AND token = 'bT1SevEil4zknBX3Hy2w3aylmuc2OuOX6h6+1orHSI8=' 
  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"
    }
  }
}