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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e54c03cf2abd6fbcfade048c53f231174b03499a0e2fd8259600c6a84fe026' 
  AND token = 'AmkXladMODTEt2k+6+HROt/MvCAE6My+TNohgifUw+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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