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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e66ec5727f49f5b082184a4115c914b97b7196c2e6c9f67402bc76cfee5e4c' 
  AND token = '6mOu5M9jo2j+0/JWbsy4oN0m/BMyYqmTC8bRbqMquxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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