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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a41106eecd9f4784a1629102df3cfed83a862710f17752d0c8da7d3b5895be0' 
  AND token = 'eiY9FLmOVR76QtMRwES4Yo5BcqKBM9S/5dgoKfJTZHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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