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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a3feb645aa17bbd909fb80b2153a510d073b2c1c5b0c0a92b37ba934f42a14' 
  AND token = 'LRhxS7ju6JO4A7xFuEaPIDsjOmI7lKjpC9xciCpwVBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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