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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2ddabf058a98bba5a207250216f6a05d898820a09c871ddd2c6e6429d106d7' 
  AND token = 'fG5GURAr+E7LstPR9NHNWWtk7O8mmfxpr0iNHR5ZHsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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