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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c5b4198d27c5bdec21b993a29276c8bcc0b90672eb192f0c0c7a1f00f34b8c' 
  AND token = 'zCDagnZ8c7xeZC262tILcKLFHOqlvXubo0MgqMam9CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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