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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0d4b1212a2514ef0b02d85dce8ad7aadce3b10c6189b83fefa194c3ce75d02' 
  AND token = 'mvDyeKox2SMFgE+xlZ1q7B/bxNmIVdSAQbKBi061dZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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