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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f86b0b8f91e6be0353fd98a05247c3730446751bb3ee24d8bf855946885a8b' 
  AND token = 'dmTCtSBaSDcEDTjKoMkSg5aL79tDEKZVbkfJH/YTkec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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