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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b59900e4d5d738933115fcebc3b72d33d3ef6993a9e3e5e78c7cf5c5803fa2' 
  AND token = 'Fo631FvFPAk93yEhwBwNOI/hay2SMMrQgZN5w839l4I=' 
  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"
    }
  }
}