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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698ed2a8b53e91997b655d03421bf50a05deb231a0f164c621864ee32c834614' 
  AND token = 'vxSOBvqgdtNAxLMGvLXsJXApUpdZirNe0y9g9B6ImeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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