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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5106b4ad70828c6fa4d3f9b869123f91e466f45e835f1b8daa217b34649b3c9' 
  AND token = 'ctjm1TUs39ye0j8k0sisDL+q7+RpFeCfRjSHbT84KMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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