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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a75166e31970b0f882c859ddfaa117876411c2d8c8f7131d26261cafccc9ad8' 
  AND token = 'qE2O1EtYqa3IgVb7PhxU8utcBB6d7C6p4coB2NVNNn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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