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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e0a598e0304060ed72953824dc83fca37fd69e660899191b4fed1f974ce23e' 
  AND token = 'gOclDH4zGh1uIXU46NSVF8N2Xsq0swm2QifL/MdZR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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