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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9581a20d2cb2c7decb0e367cb31ce69cd704274a316565c2a819d6507035f634' 
  AND token = 'VWctVFjbeMGsw18DhkaS+HkXUtjoMONFrJR6C/1Nsq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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