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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264c09bfab90c48cfcfa74a1016dcfc7bc98c09e4b708463adffb7068fcca79c' 
  AND token = 'QC5NlMLEFN/jNO2HHm57hRe6pc9mONqhBW6NE2ulNQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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