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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bca750a122966997c93b60eea85c68ffe9fc1a5886e4e3c2220c50613b28c3b' 
  AND token = 'aw9nypzxSTbdz9dQbMwMzxi79bPvPN+MN3qNlaMmepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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