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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bb0e8b9db6ad1fdc477eaf264a1967d3d03ad850098ab78f9b1a49bfe01cf2' 
  AND token = 'mQrR32qGVsRU+Lr9f4r7s79gvAeANgK/82vziUVDWKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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