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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e2d0b070f41e584e8d94f58685e1706798709cde4f19ca594813c47c94fc70' 
  AND token = 'hi7Q+vRx5bcVO/hJX4UqOCsE3FvYlkb7kLawBlICE/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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