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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8004490d294235672dde8dc3f286fe748fb155a26ae4c8f8a1a91aabf0b86e7' 
  AND token = 'M8AdqpH2nkqpr957x6+KS9RIEKIu1UminU+NxufoB1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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