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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1893d5fe0c6fbdd6080d0b3b796081a1352671a6e800273f9d7300b9ce36ac84' 
  AND token = 'um25FvMGG6UuD1w2nwsI2OhyZ3us9CPP6ZlGdKixkr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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