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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4abe0982d344bee52b02f59fd03a382c1d2fdd786db9dc8ff4e965c32882d2' 
  AND token = 'nqWaytxL5sckMgOBMwia/Na84K3rYGye/erdAVvUCxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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