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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474faeb9a0a1d8348c6f77260d4feecad468ba8473e262854faca0d4d94947fc' 
  AND token = 'mL30OqC70+oKOnC2YIRBJoG5BqdlVx/Vr//m3P3D15c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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