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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315551f461f9c02de0c0287094128c6ffd14065a8cfc37c7d71e680e6dc0f32d' 
  AND token = 'L0mwu9a+j/ga6vyWa3ko2ZvR5w4TBnao4uRoOjdO0IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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