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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ce0914395e80e32e96047d6f413c336b1d97c0f70a0d55f35dda9400161721' 
  AND token = 'I1+T0B5FAKrPZLhlbT99RO2lLVrWAOfqlAN3XTkm0u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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