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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143ec3999d4e23e9bd983a29de2f3d39b70bbb3862bed76215adbbf7045ad23c' 
  AND token = 'eCb+o8q7ZRGZ9BMbfsYHo0A990KGv/b0IPK0kznc2J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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