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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327d4ed594171a7d9e45aec09e55078a922342cb0490c3a1f0d1eb7406c60485' 
  AND token = 'q3zVqcyIMdGCType+OH1qN64i3L8AH5RKQI+q6Ju6hs=' 
  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"
    }
  }
}