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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eeaf7f9a7f4a992e2068441379d11d11284f277cefc9d5fd4acd77896349e3' 
  AND token = '85DXbc4q4A4z1fpLmQ8P6UOLrjSbIiwmNQmHsf7H1gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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