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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eaed3919b02e24f98504a34ba9ca1d98eaf323332566382a7d982955c73f4c2' 
  AND token = '2SCY8SCyOPvPPkaon1c/vA007FvRr88YO2sQj7v9TCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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