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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6734a58ac4d936ca3bae100fdb10d40dd1a010a0d09185fca07d37e65a7f48' 
  AND token = 'c2YgEiu49SWF4rZ2kDvRFY/YBc/uF+5qWw3+YA+zcXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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