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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54533f0f6de8aa7d3b356c7b947f6e7096627f930e8372b438a314705a3525d9' 
  AND token = '9YtR1uTuxKGpy0PQ2QvLFTIt6e7gda+kpOPK4Z2Gt88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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