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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f8eb753ac4a2bd065fab2d0fa5ab54e417886cf71a53c5377048710c64cfd8' 
  AND token = '0Lp6/f+U1DVvNfr1r3FbkQi3esa5aEd8HX0KDMYRm6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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