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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc65c347878718ee716f4573f9537291e858db1e01184a3761c0b5548d4ad3a5' 
  AND token = 'tj3dfR+vzYOsafyA9bwlCxih6ol/7pqQPysETD58mxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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