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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc9938b300bf3cb85ee96dbbd9146372806c53412d1ab392f5112aea867c749' 
  AND token = 'O4pAayvWju9/RFHst09hXznzAGLY2Dgk9WLk6qL7GrI=' 
  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"
    }
  }
}