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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6616ab9b68120df1c6096076560cc88dad107dca08f9f30626e2e941dea8bbe4' 
  AND token = 'UXBihQ+uOHL2i5j0ba63xSDo4+oOpl8BOFrztxgAtas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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