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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4982c8872e5f0d38a8dd7e99c95cdb7075c9aac999355cce4d4c2eeed661200c' 
  AND token = '0K0lA1OP24WIJs55/3y0pcvEoHaDM3VBKnH1RaiOJhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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