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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf320286ffd1ec153ca5ff733b8bb7ee4e18e5cfc35848dcb75202d30c9beaa' 
  AND token = 'IJuJeULVeLE42687GZSZp8CpplCz2pZr+rpBDMrWU4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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