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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d3ae798917663e4d291c31c45620c1c3a5db5debd21cbf693e284b123c854e' 
  AND token = 'fsBKeOV6XAv44+Vb9IsKSf6hAF2CN/JnbVCI1tSXr0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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