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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5fd909ccda9e3baa3adc6598a2339293e1fc87021c0e397bddc555ab356c9a' 
  AND token = 'CHax5If9D1mxjPo98/mYaBvwdXfg+n7Uz1qMkTOeNm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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