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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd42edad1714bd37b534d35439c81113a414fb1fcc42ce81058121cc58f88b7' 
  AND token = 'E0gSLSIx0khtXU0yDY/SlrSSRYkxeCffphE/VFv/9xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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