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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a1bb7ac4a7d1f381e1c5d47c67d084e3f712a7aa37a71bf7e7220b35f44412' 
  AND token = 'g/L4STpUVB5imRJseDyVR9g9uoyhv+vbe+Lqp+G0IkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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