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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b31ccd4dd2213817fb71b3699ee7f3a7ae2e6f1079b37bdf5ac20a91a5aa8b7' 
  AND token = 'AcuUJSqti5VxdjXfYf7b7nLBFU0lsWzGMpQ3ML560IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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